1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "net/slirp.h" 31 #include "net/eth.h" 32 #include "util.h" 33 34 #include "monitor/monitor.h" 35 #include "qemu/help_option.h" 36 #include "qapi/qapi-commands-net.h" 37 #include "qapi/qapi-visit-net.h" 38 #include "qapi/qmp/qdict.h" 39 #include "qapi/qmp/qerror.h" 40 #include "qemu/error-report.h" 41 #include "qemu/sockets.h" 42 #include "qemu/cutils.h" 43 #include "qemu/config-file.h" 44 #include "hw/qdev.h" 45 #include "qemu/iov.h" 46 #include "qemu/main-loop.h" 47 #include "qemu/option.h" 48 #include "qapi/error.h" 49 #include "qapi/opts-visitor.h" 50 #include "sysemu/sysemu.h" 51 #include "sysemu/qtest.h" 52 #include "net/filter.h" 53 #include "qapi/string-output-visitor.h" 54 55 /* Net bridge is currently not supported for W32. */ 56 #if !defined(_WIN32) 57 # define CONFIG_NET_BRIDGE 58 #endif 59 60 static VMChangeStateEntry *net_change_state_entry; 61 static QTAILQ_HEAD(, NetClientState) net_clients; 62 63 /***********************************************************/ 64 /* network device redirectors */ 65 66 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 67 { 68 const char *p, *p1; 69 int len; 70 p = *pp; 71 p1 = strchr(p, sep); 72 if (!p1) 73 return -1; 74 len = p1 - p; 75 p1++; 76 if (buf_size > 0) { 77 if (len > buf_size - 1) 78 len = buf_size - 1; 79 memcpy(buf, p, len); 80 buf[len] = '\0'; 81 } 82 *pp = p1; 83 return 0; 84 } 85 86 int parse_host_port(struct sockaddr_in *saddr, const char *str, 87 Error **errp) 88 { 89 char buf[512]; 90 struct hostent *he; 91 const char *p, *r; 92 int port; 93 94 p = str; 95 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 96 error_setg(errp, "host address '%s' doesn't contain ':' " 97 "separating host from port", str); 98 return -1; 99 } 100 saddr->sin_family = AF_INET; 101 if (buf[0] == '\0') { 102 saddr->sin_addr.s_addr = 0; 103 } else { 104 if (qemu_isdigit(buf[0])) { 105 if (!inet_aton(buf, &saddr->sin_addr)) { 106 error_setg(errp, "host address '%s' is not a valid " 107 "IPv4 address", buf); 108 return -1; 109 } 110 } else { 111 he = gethostbyname(buf); 112 if (he == NULL) { 113 error_setg(errp, "can't resolve host address '%s'", buf); 114 return - 1; 115 } 116 saddr->sin_addr = *(struct in_addr *)he->h_addr; 117 } 118 } 119 port = strtol(p, (char **)&r, 0); 120 if (r == p) { 121 error_setg(errp, "port number '%s' is invalid", p); 122 return -1; 123 } 124 saddr->sin_port = htons(port); 125 return 0; 126 } 127 128 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 129 { 130 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 131 macaddr[0], macaddr[1], macaddr[2], 132 macaddr[3], macaddr[4], macaddr[5]); 133 } 134 135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 136 { 137 snprintf(nc->info_str, sizeof(nc->info_str), 138 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 139 nc->model, 140 macaddr[0], macaddr[1], macaddr[2], 141 macaddr[3], macaddr[4], macaddr[5]); 142 } 143 144 static int mac_table[256] = {0}; 145 146 static void qemu_macaddr_set_used(MACAddr *macaddr) 147 { 148 int index; 149 150 for (index = 0x56; index < 0xFF; index++) { 151 if (macaddr->a[5] == index) { 152 mac_table[index]++; 153 } 154 } 155 } 156 157 static void qemu_macaddr_set_free(MACAddr *macaddr) 158 { 159 int index; 160 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 161 162 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 163 return; 164 } 165 for (index = 0x56; index < 0xFF; index++) { 166 if (macaddr->a[5] == index) { 167 mac_table[index]--; 168 } 169 } 170 } 171 172 static int qemu_macaddr_get_free(void) 173 { 174 int index; 175 176 for (index = 0x56; index < 0xFF; index++) { 177 if (mac_table[index] == 0) { 178 return index; 179 } 180 } 181 182 return -1; 183 } 184 185 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 186 { 187 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 188 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 189 190 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 191 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 192 return; 193 } else { 194 qemu_macaddr_set_used(macaddr); 195 return; 196 } 197 } 198 199 macaddr->a[0] = 0x52; 200 macaddr->a[1] = 0x54; 201 macaddr->a[2] = 0x00; 202 macaddr->a[3] = 0x12; 203 macaddr->a[4] = 0x34; 204 macaddr->a[5] = qemu_macaddr_get_free(); 205 qemu_macaddr_set_used(macaddr); 206 } 207 208 /** 209 * Generate a name for net client 210 * 211 * Only net clients created with the legacy -net option and NICs need this. 212 */ 213 static char *assign_name(NetClientState *nc1, const char *model) 214 { 215 NetClientState *nc; 216 int id = 0; 217 218 QTAILQ_FOREACH(nc, &net_clients, next) { 219 if (nc == nc1) { 220 continue; 221 } 222 if (strcmp(nc->model, model) == 0) { 223 id++; 224 } 225 } 226 227 return g_strdup_printf("%s.%d", model, id); 228 } 229 230 static void qemu_net_client_destructor(NetClientState *nc) 231 { 232 g_free(nc); 233 } 234 235 static void qemu_net_client_setup(NetClientState *nc, 236 NetClientInfo *info, 237 NetClientState *peer, 238 const char *model, 239 const char *name, 240 NetClientDestructor *destructor) 241 { 242 nc->info = info; 243 nc->model = g_strdup(model); 244 if (name) { 245 nc->name = g_strdup(name); 246 } else { 247 nc->name = assign_name(nc, model); 248 } 249 250 if (peer) { 251 assert(!peer->peer); 252 nc->peer = peer; 253 peer->peer = nc; 254 } 255 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 256 257 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 258 nc->destructor = destructor; 259 QTAILQ_INIT(&nc->filters); 260 } 261 262 NetClientState *qemu_new_net_client(NetClientInfo *info, 263 NetClientState *peer, 264 const char *model, 265 const char *name) 266 { 267 NetClientState *nc; 268 269 assert(info->size >= sizeof(NetClientState)); 270 271 nc = g_malloc0(info->size); 272 qemu_net_client_setup(nc, info, peer, model, name, 273 qemu_net_client_destructor); 274 275 return nc; 276 } 277 278 NICState *qemu_new_nic(NetClientInfo *info, 279 NICConf *conf, 280 const char *model, 281 const char *name, 282 void *opaque) 283 { 284 NetClientState **peers = conf->peers.ncs; 285 NICState *nic; 286 int i, queues = MAX(1, conf->peers.queues); 287 288 assert(info->type == NET_CLIENT_DRIVER_NIC); 289 assert(info->size >= sizeof(NICState)); 290 291 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 292 nic->ncs = (void *)nic + info->size; 293 nic->conf = conf; 294 nic->opaque = opaque; 295 296 for (i = 0; i < queues; i++) { 297 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 298 NULL); 299 nic->ncs[i].queue_index = i; 300 } 301 302 return nic; 303 } 304 305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 306 { 307 return nic->ncs + queue_index; 308 } 309 310 NetClientState *qemu_get_queue(NICState *nic) 311 { 312 return qemu_get_subqueue(nic, 0); 313 } 314 315 NICState *qemu_get_nic(NetClientState *nc) 316 { 317 NetClientState *nc0 = nc - nc->queue_index; 318 319 return (NICState *)((void *)nc0 - nc->info->size); 320 } 321 322 void *qemu_get_nic_opaque(NetClientState *nc) 323 { 324 NICState *nic = qemu_get_nic(nc); 325 326 return nic->opaque; 327 } 328 329 static void qemu_cleanup_net_client(NetClientState *nc) 330 { 331 QTAILQ_REMOVE(&net_clients, nc, next); 332 333 if (nc->info->cleanup) { 334 nc->info->cleanup(nc); 335 } 336 } 337 338 static void qemu_free_net_client(NetClientState *nc) 339 { 340 if (nc->incoming_queue) { 341 qemu_del_net_queue(nc->incoming_queue); 342 } 343 if (nc->peer) { 344 nc->peer->peer = NULL; 345 } 346 g_free(nc->name); 347 g_free(nc->model); 348 if (nc->destructor) { 349 nc->destructor(nc); 350 } 351 } 352 353 void qemu_del_net_client(NetClientState *nc) 354 { 355 NetClientState *ncs[MAX_QUEUE_NUM]; 356 int queues, i; 357 NetFilterState *nf, *next; 358 359 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 360 361 /* If the NetClientState belongs to a multiqueue backend, we will change all 362 * other NetClientStates also. 363 */ 364 queues = qemu_find_net_clients_except(nc->name, ncs, 365 NET_CLIENT_DRIVER_NIC, 366 MAX_QUEUE_NUM); 367 assert(queues != 0); 368 369 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 370 object_unparent(OBJECT(nf)); 371 } 372 373 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 374 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 375 NICState *nic = qemu_get_nic(nc->peer); 376 if (nic->peer_deleted) { 377 return; 378 } 379 nic->peer_deleted = true; 380 381 for (i = 0; i < queues; i++) { 382 ncs[i]->peer->link_down = true; 383 } 384 385 if (nc->peer->info->link_status_changed) { 386 nc->peer->info->link_status_changed(nc->peer); 387 } 388 389 for (i = 0; i < queues; i++) { 390 qemu_cleanup_net_client(ncs[i]); 391 } 392 393 return; 394 } 395 396 for (i = 0; i < queues; i++) { 397 qemu_cleanup_net_client(ncs[i]); 398 qemu_free_net_client(ncs[i]); 399 } 400 } 401 402 void qemu_del_nic(NICState *nic) 403 { 404 int i, queues = MAX(nic->conf->peers.queues, 1); 405 406 qemu_macaddr_set_free(&nic->conf->macaddr); 407 408 /* If this is a peer NIC and peer has already been deleted, free it now. */ 409 if (nic->peer_deleted) { 410 for (i = 0; i < queues; i++) { 411 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 412 } 413 } 414 415 for (i = queues - 1; i >= 0; i--) { 416 NetClientState *nc = qemu_get_subqueue(nic, i); 417 418 qemu_cleanup_net_client(nc); 419 qemu_free_net_client(nc); 420 } 421 422 g_free(nic); 423 } 424 425 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 426 { 427 NetClientState *nc; 428 429 QTAILQ_FOREACH(nc, &net_clients, next) { 430 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 431 if (nc->queue_index == 0) { 432 func(qemu_get_nic(nc), opaque); 433 } 434 } 435 } 436 } 437 438 bool qemu_has_ufo(NetClientState *nc) 439 { 440 if (!nc || !nc->info->has_ufo) { 441 return false; 442 } 443 444 return nc->info->has_ufo(nc); 445 } 446 447 bool qemu_has_vnet_hdr(NetClientState *nc) 448 { 449 if (!nc || !nc->info->has_vnet_hdr) { 450 return false; 451 } 452 453 return nc->info->has_vnet_hdr(nc); 454 } 455 456 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 457 { 458 if (!nc || !nc->info->has_vnet_hdr_len) { 459 return false; 460 } 461 462 return nc->info->has_vnet_hdr_len(nc, len); 463 } 464 465 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 466 { 467 if (!nc || !nc->info->using_vnet_hdr) { 468 return; 469 } 470 471 nc->info->using_vnet_hdr(nc, enable); 472 } 473 474 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 475 int ecn, int ufo) 476 { 477 if (!nc || !nc->info->set_offload) { 478 return; 479 } 480 481 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 482 } 483 484 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 485 { 486 if (!nc || !nc->info->set_vnet_hdr_len) { 487 return; 488 } 489 490 nc->vnet_hdr_len = len; 491 nc->info->set_vnet_hdr_len(nc, len); 492 } 493 494 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 495 { 496 #ifdef HOST_WORDS_BIGENDIAN 497 if (!nc || !nc->info->set_vnet_le) { 498 return -ENOSYS; 499 } 500 501 return nc->info->set_vnet_le(nc, is_le); 502 #else 503 return 0; 504 #endif 505 } 506 507 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 508 { 509 #ifdef HOST_WORDS_BIGENDIAN 510 return 0; 511 #else 512 if (!nc || !nc->info->set_vnet_be) { 513 return -ENOSYS; 514 } 515 516 return nc->info->set_vnet_be(nc, is_be); 517 #endif 518 } 519 520 int qemu_can_send_packet(NetClientState *sender) 521 { 522 int vm_running = runstate_is_running(); 523 524 if (!vm_running) { 525 return 0; 526 } 527 528 if (!sender->peer) { 529 return 1; 530 } 531 532 if (sender->peer->receive_disabled) { 533 return 0; 534 } else if (sender->peer->info->can_receive && 535 !sender->peer->info->can_receive(sender->peer)) { 536 return 0; 537 } 538 return 1; 539 } 540 541 static ssize_t filter_receive_iov(NetClientState *nc, 542 NetFilterDirection direction, 543 NetClientState *sender, 544 unsigned flags, 545 const struct iovec *iov, 546 int iovcnt, 547 NetPacketSent *sent_cb) 548 { 549 ssize_t ret = 0; 550 NetFilterState *nf = NULL; 551 552 if (direction == NET_FILTER_DIRECTION_TX) { 553 QTAILQ_FOREACH(nf, &nc->filters, next) { 554 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 555 iovcnt, sent_cb); 556 if (ret) { 557 return ret; 558 } 559 } 560 } else { 561 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) { 562 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 563 iovcnt, sent_cb); 564 if (ret) { 565 return ret; 566 } 567 } 568 } 569 570 return ret; 571 } 572 573 static ssize_t filter_receive(NetClientState *nc, 574 NetFilterDirection direction, 575 NetClientState *sender, 576 unsigned flags, 577 const uint8_t *data, 578 size_t size, 579 NetPacketSent *sent_cb) 580 { 581 struct iovec iov = { 582 .iov_base = (void *)data, 583 .iov_len = size 584 }; 585 586 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 587 } 588 589 void qemu_purge_queued_packets(NetClientState *nc) 590 { 591 if (!nc->peer) { 592 return; 593 } 594 595 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 596 } 597 598 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 599 { 600 nc->receive_disabled = 0; 601 602 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 603 if (net_hub_flush(nc->peer)) { 604 qemu_notify_event(); 605 } 606 } 607 if (qemu_net_queue_flush(nc->incoming_queue)) { 608 /* We emptied the queue successfully, signal to the IO thread to repoll 609 * the file descriptor (for tap, for example). 610 */ 611 qemu_notify_event(); 612 } else if (purge) { 613 /* Unable to empty the queue, purge remaining packets */ 614 qemu_net_queue_purge(nc->incoming_queue, nc); 615 } 616 } 617 618 void qemu_flush_queued_packets(NetClientState *nc) 619 { 620 qemu_flush_or_purge_queued_packets(nc, false); 621 } 622 623 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 624 unsigned flags, 625 const uint8_t *buf, int size, 626 NetPacketSent *sent_cb) 627 { 628 NetQueue *queue; 629 int ret; 630 631 #ifdef DEBUG_NET 632 printf("qemu_send_packet_async:\n"); 633 qemu_hexdump((const char *)buf, stdout, "net", size); 634 #endif 635 636 if (sender->link_down || !sender->peer) { 637 return size; 638 } 639 640 /* Let filters handle the packet first */ 641 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 642 sender, flags, buf, size, sent_cb); 643 if (ret) { 644 return ret; 645 } 646 647 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 648 sender, flags, buf, size, sent_cb); 649 if (ret) { 650 return ret; 651 } 652 653 queue = sender->peer->incoming_queue; 654 655 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 656 } 657 658 ssize_t qemu_send_packet_async(NetClientState *sender, 659 const uint8_t *buf, int size, 660 NetPacketSent *sent_cb) 661 { 662 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 663 buf, size, sent_cb); 664 } 665 666 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 667 { 668 qemu_send_packet_async(nc, buf, size, NULL); 669 } 670 671 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 672 { 673 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 674 buf, size, NULL); 675 } 676 677 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 678 int iovcnt, unsigned flags) 679 { 680 uint8_t *buf = NULL; 681 uint8_t *buffer; 682 size_t offset; 683 ssize_t ret; 684 685 if (iovcnt == 1) { 686 buffer = iov[0].iov_base; 687 offset = iov[0].iov_len; 688 } else { 689 offset = iov_size(iov, iovcnt); 690 if (offset > NET_BUFSIZE) { 691 return -1; 692 } 693 buf = g_malloc(offset); 694 buffer = buf; 695 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 696 } 697 698 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 699 ret = nc->info->receive_raw(nc, buffer, offset); 700 } else { 701 ret = nc->info->receive(nc, buffer, offset); 702 } 703 704 g_free(buf); 705 return ret; 706 } 707 708 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 709 unsigned flags, 710 const struct iovec *iov, 711 int iovcnt, 712 void *opaque) 713 { 714 NetClientState *nc = opaque; 715 int ret; 716 717 if (nc->link_down) { 718 return iov_size(iov, iovcnt); 719 } 720 721 if (nc->receive_disabled) { 722 return 0; 723 } 724 725 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 726 ret = nc->info->receive_iov(nc, iov, iovcnt); 727 } else { 728 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 729 } 730 731 if (ret == 0) { 732 nc->receive_disabled = 1; 733 } 734 735 return ret; 736 } 737 738 ssize_t qemu_sendv_packet_async(NetClientState *sender, 739 const struct iovec *iov, int iovcnt, 740 NetPacketSent *sent_cb) 741 { 742 NetQueue *queue; 743 int ret; 744 745 if (sender->link_down || !sender->peer) { 746 return iov_size(iov, iovcnt); 747 } 748 749 /* Let filters handle the packet first */ 750 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 751 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 752 if (ret) { 753 return ret; 754 } 755 756 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 757 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 758 if (ret) { 759 return ret; 760 } 761 762 queue = sender->peer->incoming_queue; 763 764 return qemu_net_queue_send_iov(queue, sender, 765 QEMU_NET_PACKET_FLAG_NONE, 766 iov, iovcnt, sent_cb); 767 } 768 769 ssize_t 770 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 771 { 772 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 773 } 774 775 NetClientState *qemu_find_netdev(const char *id) 776 { 777 NetClientState *nc; 778 779 QTAILQ_FOREACH(nc, &net_clients, next) { 780 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 781 continue; 782 if (!strcmp(nc->name, id)) { 783 return nc; 784 } 785 } 786 787 return NULL; 788 } 789 790 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 791 NetClientDriver type, int max) 792 { 793 NetClientState *nc; 794 int ret = 0; 795 796 QTAILQ_FOREACH(nc, &net_clients, next) { 797 if (nc->info->type == type) { 798 continue; 799 } 800 if (!id || !strcmp(nc->name, id)) { 801 if (ret < max) { 802 ncs[ret] = nc; 803 } 804 ret++; 805 } 806 } 807 808 return ret; 809 } 810 811 static int nic_get_free_idx(void) 812 { 813 int index; 814 815 for (index = 0; index < MAX_NICS; index++) 816 if (!nd_table[index].used) 817 return index; 818 return -1; 819 } 820 821 int qemu_show_nic_models(const char *arg, const char *const *models) 822 { 823 int i; 824 825 if (!arg || !is_help_option(arg)) { 826 return 0; 827 } 828 829 fprintf(stderr, "qemu: Supported NIC models: "); 830 for (i = 0 ; models[i]; i++) 831 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 832 return 1; 833 } 834 835 void qemu_check_nic_model(NICInfo *nd, const char *model) 836 { 837 const char *models[2]; 838 839 models[0] = model; 840 models[1] = NULL; 841 842 if (qemu_show_nic_models(nd->model, models)) 843 exit(0); 844 if (qemu_find_nic_model(nd, models, model) < 0) 845 exit(1); 846 } 847 848 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 849 const char *default_model) 850 { 851 int i; 852 853 if (!nd->model) 854 nd->model = g_strdup(default_model); 855 856 for (i = 0 ; models[i]; i++) { 857 if (strcmp(nd->model, models[i]) == 0) 858 return i; 859 } 860 861 error_report("Unsupported NIC model: %s", nd->model); 862 return -1; 863 } 864 865 static int net_init_nic(const Netdev *netdev, const char *name, 866 NetClientState *peer, Error **errp) 867 { 868 int idx; 869 NICInfo *nd; 870 const NetLegacyNicOptions *nic; 871 872 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 873 nic = &netdev->u.nic; 874 875 idx = nic_get_free_idx(); 876 if (idx == -1 || nb_nics >= MAX_NICS) { 877 error_setg(errp, "too many NICs"); 878 return -1; 879 } 880 881 nd = &nd_table[idx]; 882 883 memset(nd, 0, sizeof(*nd)); 884 885 if (nic->has_netdev) { 886 nd->netdev = qemu_find_netdev(nic->netdev); 887 if (!nd->netdev) { 888 error_setg(errp, "netdev '%s' not found", nic->netdev); 889 return -1; 890 } 891 } else { 892 assert(peer); 893 nd->netdev = peer; 894 } 895 nd->name = g_strdup(name); 896 if (nic->has_model) { 897 nd->model = g_strdup(nic->model); 898 } 899 if (nic->has_addr) { 900 nd->devaddr = g_strdup(nic->addr); 901 } 902 903 if (nic->has_macaddr && 904 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 905 error_setg(errp, "invalid syntax for ethernet address"); 906 return -1; 907 } 908 if (nic->has_macaddr && 909 is_multicast_ether_addr(nd->macaddr.a)) { 910 error_setg(errp, 911 "NIC cannot have multicast MAC address (odd 1st byte)"); 912 return -1; 913 } 914 qemu_macaddr_default_if_unset(&nd->macaddr); 915 916 if (nic->has_vectors) { 917 if (nic->vectors > 0x7ffffff) { 918 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 919 return -1; 920 } 921 nd->nvectors = nic->vectors; 922 } else { 923 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 924 } 925 926 nd->used = 1; 927 nb_nics++; 928 929 return idx; 930 } 931 932 933 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 934 const Netdev *netdev, 935 const char *name, 936 NetClientState *peer, Error **errp) = { 937 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 938 #ifdef CONFIG_SLIRP 939 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 940 #endif 941 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 942 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 943 #ifdef CONFIG_VDE 944 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 945 #endif 946 #ifdef CONFIG_NETMAP 947 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 948 #endif 949 #ifdef CONFIG_NET_BRIDGE 950 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 951 #endif 952 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 953 #ifdef CONFIG_VHOST_NET_USED 954 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 955 #endif 956 #ifdef CONFIG_L2TPV3 957 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 958 #endif 959 }; 960 961 962 static int net_client_init1(const void *object, bool is_netdev, Error **errp) 963 { 964 Netdev legacy = {0}; 965 const Netdev *netdev; 966 const char *name; 967 NetClientState *peer = NULL; 968 969 if (is_netdev) { 970 netdev = object; 971 name = netdev->id; 972 973 if (netdev->type == NET_CLIENT_DRIVER_NIC || 974 !net_client_init_fun[netdev->type]) { 975 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 976 "a netdev backend type"); 977 return -1; 978 } 979 } else { 980 const NetLegacy *net = object; 981 const NetLegacyOptions *opts = net->opts; 982 legacy.id = net->id; 983 netdev = &legacy; 984 /* missing optional values have been initialized to "all bits zero" */ 985 name = net->has_id ? net->id : net->name; 986 987 /* Map the old options to the new flat type */ 988 switch (opts->type) { 989 case NET_LEGACY_OPTIONS_TYPE_NONE: 990 return 0; /* nothing to do */ 991 case NET_LEGACY_OPTIONS_TYPE_NIC: 992 legacy.type = NET_CLIENT_DRIVER_NIC; 993 legacy.u.nic = opts->u.nic; 994 break; 995 case NET_LEGACY_OPTIONS_TYPE_USER: 996 legacy.type = NET_CLIENT_DRIVER_USER; 997 legacy.u.user = opts->u.user; 998 break; 999 case NET_LEGACY_OPTIONS_TYPE_TAP: 1000 legacy.type = NET_CLIENT_DRIVER_TAP; 1001 legacy.u.tap = opts->u.tap; 1002 break; 1003 case NET_LEGACY_OPTIONS_TYPE_L2TPV3: 1004 legacy.type = NET_CLIENT_DRIVER_L2TPV3; 1005 legacy.u.l2tpv3 = opts->u.l2tpv3; 1006 break; 1007 case NET_LEGACY_OPTIONS_TYPE_SOCKET: 1008 legacy.type = NET_CLIENT_DRIVER_SOCKET; 1009 legacy.u.socket = opts->u.socket; 1010 break; 1011 case NET_LEGACY_OPTIONS_TYPE_VDE: 1012 legacy.type = NET_CLIENT_DRIVER_VDE; 1013 legacy.u.vde = opts->u.vde; 1014 break; 1015 case NET_LEGACY_OPTIONS_TYPE_BRIDGE: 1016 legacy.type = NET_CLIENT_DRIVER_BRIDGE; 1017 legacy.u.bridge = opts->u.bridge; 1018 break; 1019 case NET_LEGACY_OPTIONS_TYPE_NETMAP: 1020 legacy.type = NET_CLIENT_DRIVER_NETMAP; 1021 legacy.u.netmap = opts->u.netmap; 1022 break; 1023 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER: 1024 legacy.type = NET_CLIENT_DRIVER_VHOST_USER; 1025 legacy.u.vhost_user = opts->u.vhost_user; 1026 break; 1027 default: 1028 abort(); 1029 } 1030 1031 if (!net_client_init_fun[netdev->type]) { 1032 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1033 "a net backend type (maybe it is not compiled " 1034 "into this binary)"); 1035 return -1; 1036 } 1037 1038 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1039 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1040 !opts->u.nic.has_netdev) { 1041 peer = net_hub_add_port(0, NULL, NULL); 1042 } 1043 } 1044 1045 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) { 1046 /* FIXME drop when all init functions store an Error */ 1047 if (errp && !*errp) { 1048 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1049 NetClientDriver_str(netdev->type)); 1050 } 1051 return -1; 1052 } 1053 return 0; 1054 } 1055 1056 static void show_netdevs(void) 1057 { 1058 int idx; 1059 const char *available_netdevs[] = { 1060 "socket", 1061 "hubport", 1062 "tap", 1063 #ifdef CONFIG_SLIRP 1064 "user", 1065 #endif 1066 #ifdef CONFIG_L2TPV3 1067 "l2tpv3", 1068 #endif 1069 #ifdef CONFIG_VDE 1070 "vde", 1071 #endif 1072 #ifdef CONFIG_NET_BRIDGE 1073 "bridge", 1074 #endif 1075 #ifdef CONFIG_NETMAP 1076 "netmap", 1077 #endif 1078 #ifdef CONFIG_POSIX 1079 "vhost-user", 1080 #endif 1081 }; 1082 1083 printf("Available netdev backend types:\n"); 1084 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1085 puts(available_netdevs[idx]); 1086 } 1087 } 1088 1089 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1090 { 1091 void *object = NULL; 1092 Error *err = NULL; 1093 int ret = -1; 1094 Visitor *v = opts_visitor_new(opts); 1095 1096 if (is_netdev && is_help_option(qemu_opt_get(opts, "type"))) { 1097 show_netdevs(); 1098 exit(0); 1099 } else { 1100 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1101 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1102 1103 if (ip6_net) { 1104 char buf[strlen(ip6_net) + 1]; 1105 1106 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1107 /* Default 64bit prefix length. */ 1108 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1109 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1110 } else { 1111 /* User-specified prefix length. */ 1112 unsigned long len; 1113 int err; 1114 1115 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1116 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1117 1118 if (err) { 1119 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1120 "ipv6-prefix", "a number"); 1121 } else { 1122 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1123 &error_abort); 1124 } 1125 } 1126 qemu_opt_unset(opts, "ipv6-net"); 1127 } 1128 } 1129 1130 if (is_netdev) { 1131 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1132 } else { 1133 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1134 } 1135 1136 if (!err) { 1137 ret = net_client_init1(object, is_netdev, &err); 1138 } 1139 1140 if (is_netdev) { 1141 qapi_free_Netdev(object); 1142 } else { 1143 qapi_free_NetLegacy(object); 1144 } 1145 1146 error_propagate(errp, err); 1147 visit_free(v); 1148 return ret; 1149 } 1150 1151 void netdev_add(QemuOpts *opts, Error **errp) 1152 { 1153 net_client_init(opts, true, errp); 1154 } 1155 1156 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1157 { 1158 Error *local_err = NULL; 1159 QemuOptsList *opts_list; 1160 QemuOpts *opts; 1161 1162 opts_list = qemu_find_opts_err("netdev", &local_err); 1163 if (local_err) { 1164 goto out; 1165 } 1166 1167 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1168 if (local_err) { 1169 goto out; 1170 } 1171 1172 netdev_add(opts, &local_err); 1173 if (local_err) { 1174 qemu_opts_del(opts); 1175 goto out; 1176 } 1177 1178 out: 1179 error_propagate(errp, local_err); 1180 } 1181 1182 void qmp_netdev_del(const char *id, Error **errp) 1183 { 1184 NetClientState *nc; 1185 QemuOpts *opts; 1186 1187 nc = qemu_find_netdev(id); 1188 if (!nc) { 1189 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1190 "Device '%s' not found", id); 1191 return; 1192 } 1193 1194 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1195 if (!opts) { 1196 error_setg(errp, "Device '%s' is not a netdev", id); 1197 return; 1198 } 1199 1200 qemu_del_net_client(nc); 1201 qemu_opts_del(opts); 1202 } 1203 1204 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1205 { 1206 char *str; 1207 ObjectProperty *prop; 1208 ObjectPropertyIterator iter; 1209 Visitor *v; 1210 1211 /* generate info str */ 1212 object_property_iter_init(&iter, OBJECT(nf)); 1213 while ((prop = object_property_iter_next(&iter))) { 1214 if (!strcmp(prop->name, "type")) { 1215 continue; 1216 } 1217 v = string_output_visitor_new(false, &str); 1218 object_property_get(OBJECT(nf), v, prop->name, NULL); 1219 visit_complete(v, &str); 1220 visit_free(v); 1221 monitor_printf(mon, ",%s=%s", prop->name, str); 1222 g_free(str); 1223 } 1224 monitor_printf(mon, "\n"); 1225 } 1226 1227 void print_net_client(Monitor *mon, NetClientState *nc) 1228 { 1229 NetFilterState *nf; 1230 1231 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1232 nc->queue_index, 1233 NetClientDriver_str(nc->info->type), 1234 nc->info_str); 1235 if (!QTAILQ_EMPTY(&nc->filters)) { 1236 monitor_printf(mon, "filters:\n"); 1237 } 1238 QTAILQ_FOREACH(nf, &nc->filters, next) { 1239 char *path = object_get_canonical_path_component(OBJECT(nf)); 1240 1241 monitor_printf(mon, " - %s: type=%s", path, 1242 object_get_typename(OBJECT(nf))); 1243 netfilter_print_info(mon, nf); 1244 g_free(path); 1245 } 1246 } 1247 1248 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1249 Error **errp) 1250 { 1251 NetClientState *nc; 1252 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1253 1254 QTAILQ_FOREACH(nc, &net_clients, next) { 1255 RxFilterInfoList *entry; 1256 RxFilterInfo *info; 1257 1258 if (has_name && strcmp(nc->name, name) != 0) { 1259 continue; 1260 } 1261 1262 /* only query rx-filter information of NIC */ 1263 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1264 if (has_name) { 1265 error_setg(errp, "net client(%s) isn't a NIC", name); 1266 return NULL; 1267 } 1268 continue; 1269 } 1270 1271 /* only query information on queue 0 since the info is per nic, 1272 * not per queue 1273 */ 1274 if (nc->queue_index != 0) 1275 continue; 1276 1277 if (nc->info->query_rx_filter) { 1278 info = nc->info->query_rx_filter(nc); 1279 entry = g_malloc0(sizeof(*entry)); 1280 entry->value = info; 1281 1282 if (!filter_list) { 1283 filter_list = entry; 1284 } else { 1285 last_entry->next = entry; 1286 } 1287 last_entry = entry; 1288 } else if (has_name) { 1289 error_setg(errp, "net client(%s) doesn't support" 1290 " rx-filter querying", name); 1291 return NULL; 1292 } 1293 1294 if (has_name) { 1295 break; 1296 } 1297 } 1298 1299 if (filter_list == NULL && has_name) { 1300 error_setg(errp, "invalid net client name: %s", name); 1301 } 1302 1303 return filter_list; 1304 } 1305 1306 void hmp_info_network(Monitor *mon, const QDict *qdict) 1307 { 1308 NetClientState *nc, *peer; 1309 NetClientDriver type; 1310 1311 net_hub_info(mon); 1312 1313 QTAILQ_FOREACH(nc, &net_clients, next) { 1314 peer = nc->peer; 1315 type = nc->info->type; 1316 1317 /* Skip if already printed in hub info */ 1318 if (net_hub_id_for_client(nc, NULL) == 0) { 1319 continue; 1320 } 1321 1322 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1323 print_net_client(mon, nc); 1324 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1325 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1326 monitor_printf(mon, " \\ "); 1327 print_net_client(mon, peer); 1328 } 1329 } 1330 } 1331 1332 void qmp_set_link(const char *name, bool up, Error **errp) 1333 { 1334 NetClientState *ncs[MAX_QUEUE_NUM]; 1335 NetClientState *nc; 1336 int queues, i; 1337 1338 queues = qemu_find_net_clients_except(name, ncs, 1339 NET_CLIENT_DRIVER__MAX, 1340 MAX_QUEUE_NUM); 1341 1342 if (queues == 0) { 1343 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1344 "Device '%s' not found", name); 1345 return; 1346 } 1347 nc = ncs[0]; 1348 1349 for (i = 0; i < queues; i++) { 1350 ncs[i]->link_down = !up; 1351 } 1352 1353 if (nc->info->link_status_changed) { 1354 nc->info->link_status_changed(nc); 1355 } 1356 1357 if (nc->peer) { 1358 /* Change peer link only if the peer is NIC and then notify peer. 1359 * If the peer is a HUBPORT or a backend, we do not change the 1360 * link status. 1361 * 1362 * This behavior is compatible with qemu hubs where there could be 1363 * multiple clients that can still communicate with each other in 1364 * disconnected mode. For now maintain this compatibility. 1365 */ 1366 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1367 for (i = 0; i < queues; i++) { 1368 ncs[i]->peer->link_down = !up; 1369 } 1370 } 1371 if (nc->peer->info->link_status_changed) { 1372 nc->peer->info->link_status_changed(nc->peer); 1373 } 1374 } 1375 } 1376 1377 static void net_vm_change_state_handler(void *opaque, int running, 1378 RunState state) 1379 { 1380 NetClientState *nc; 1381 NetClientState *tmp; 1382 1383 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1384 if (running) { 1385 /* Flush queued packets and wake up backends. */ 1386 if (nc->peer && qemu_can_send_packet(nc)) { 1387 qemu_flush_queued_packets(nc->peer); 1388 } 1389 } else { 1390 /* Complete all queued packets, to guarantee we don't modify 1391 * state later when VM is not running. 1392 */ 1393 qemu_flush_or_purge_queued_packets(nc, true); 1394 } 1395 } 1396 } 1397 1398 void net_cleanup(void) 1399 { 1400 NetClientState *nc; 1401 1402 /* We may del multiple entries during qemu_del_net_client(), 1403 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1404 */ 1405 while (!QTAILQ_EMPTY(&net_clients)) { 1406 nc = QTAILQ_FIRST(&net_clients); 1407 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1408 qemu_del_nic(qemu_get_nic(nc)); 1409 } else { 1410 qemu_del_net_client(nc); 1411 } 1412 } 1413 1414 qemu_del_vm_change_state_handler(net_change_state_entry); 1415 } 1416 1417 void net_check_clients(void) 1418 { 1419 NetClientState *nc; 1420 int i; 1421 1422 net_hub_check_clients(); 1423 1424 QTAILQ_FOREACH(nc, &net_clients, next) { 1425 if (!nc->peer) { 1426 warn_report("%s %s has no peer", 1427 nc->info->type == NET_CLIENT_DRIVER_NIC 1428 ? "nic" : "netdev", 1429 nc->name); 1430 } 1431 } 1432 1433 /* Check that all NICs requested via -net nic actually got created. 1434 * NICs created via -device don't need to be checked here because 1435 * they are always instantiated. 1436 */ 1437 for (i = 0; i < MAX_NICS; i++) { 1438 NICInfo *nd = &nd_table[i]; 1439 if (nd->used && !nd->instantiated) { 1440 warn_report("requested NIC (%s, model %s) " 1441 "was not created (not supported by this machine?)", 1442 nd->name ? nd->name : "anonymous", 1443 nd->model ? nd->model : "unspecified"); 1444 } 1445 } 1446 } 1447 1448 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1449 { 1450 return net_client_init(opts, false, errp); 1451 } 1452 1453 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1454 { 1455 return net_client_init(opts, true, errp); 1456 } 1457 1458 /* For the convenience "--nic" parameter */ 1459 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1460 { 1461 char *mac, *nd_id; 1462 int idx, ret; 1463 NICInfo *ni; 1464 const char *type; 1465 1466 type = qemu_opt_get(opts, "type"); 1467 if (type && g_str_equal(type, "none")) { 1468 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1469 } 1470 1471 idx = nic_get_free_idx(); 1472 if (idx == -1 || nb_nics >= MAX_NICS) { 1473 error_setg(errp, "no more on-board/default NIC slots available"); 1474 return -1; 1475 } 1476 1477 if (!type) { 1478 qemu_opt_set(opts, "type", "user", &error_abort); 1479 } 1480 1481 ni = &nd_table[idx]; 1482 memset(ni, 0, sizeof(*ni)); 1483 ni->model = qemu_opt_get_del(opts, "model"); 1484 1485 /* Create an ID if the user did not specify one */ 1486 nd_id = g_strdup(qemu_opts_id(opts)); 1487 if (!nd_id) { 1488 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx); 1489 qemu_opts_set_id(opts, nd_id); 1490 } 1491 1492 /* Handle MAC address */ 1493 mac = qemu_opt_get_del(opts, "mac"); 1494 if (mac) { 1495 ret = net_parse_macaddr(ni->macaddr.a, mac); 1496 g_free(mac); 1497 if (ret) { 1498 error_setg(errp, "invalid syntax for ethernet address"); 1499 goto out; 1500 } 1501 if (is_multicast_ether_addr(ni->macaddr.a)) { 1502 error_setg(errp, "NIC cannot have multicast MAC address"); 1503 ret = -1; 1504 goto out; 1505 } 1506 } 1507 qemu_macaddr_default_if_unset(&ni->macaddr); 1508 1509 ret = net_client_init(opts, true, errp); 1510 if (ret == 0) { 1511 ni->netdev = qemu_find_netdev(nd_id); 1512 ni->used = true; 1513 nb_nics++; 1514 } 1515 1516 out: 1517 g_free(nd_id); 1518 return ret; 1519 } 1520 1521 int net_init_clients(Error **errp) 1522 { 1523 net_change_state_entry = 1524 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1525 1526 QTAILQ_INIT(&net_clients); 1527 1528 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1529 net_init_netdev, NULL, errp)) { 1530 return -1; 1531 } 1532 1533 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1534 return -1; 1535 } 1536 1537 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1538 return -1; 1539 } 1540 1541 return 0; 1542 } 1543 1544 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1545 { 1546 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1547 return -1; 1548 } 1549 1550 return 0; 1551 } 1552 1553 /* From FreeBSD */ 1554 /* XXX: optimize */ 1555 uint32_t net_crc32(const uint8_t *p, int len) 1556 { 1557 uint32_t crc; 1558 int carry, i, j; 1559 uint8_t b; 1560 1561 crc = 0xffffffff; 1562 for (i = 0; i < len; i++) { 1563 b = *p++; 1564 for (j = 0; j < 8; j++) { 1565 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1566 crc <<= 1; 1567 b >>= 1; 1568 if (carry) { 1569 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1570 } 1571 } 1572 } 1573 1574 return crc; 1575 } 1576 1577 uint32_t net_crc32_le(const uint8_t *p, int len) 1578 { 1579 uint32_t crc; 1580 int carry, i, j; 1581 uint8_t b; 1582 1583 crc = 0xffffffff; 1584 for (i = 0; i < len; i++) { 1585 b = *p++; 1586 for (j = 0; j < 8; j++) { 1587 carry = (crc & 0x1) ^ (b & 0x01); 1588 crc >>= 1; 1589 b >>= 1; 1590 if (carry) { 1591 crc ^= POLYNOMIAL_LE; 1592 } 1593 } 1594 } 1595 1596 return crc; 1597 } 1598 1599 QemuOptsList qemu_netdev_opts = { 1600 .name = "netdev", 1601 .implied_opt_name = "type", 1602 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1603 .desc = { 1604 /* 1605 * no elements => accept any params 1606 * validation will happen later 1607 */ 1608 { /* end of list */ } 1609 }, 1610 }; 1611 1612 QemuOptsList qemu_nic_opts = { 1613 .name = "nic", 1614 .implied_opt_name = "type", 1615 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1616 .desc = { 1617 /* 1618 * no elements => accept any params 1619 * validation will happen later 1620 */ 1621 { /* end of list */ } 1622 }, 1623 }; 1624 1625 QemuOptsList qemu_net_opts = { 1626 .name = "net", 1627 .implied_opt_name = "type", 1628 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1629 .desc = { 1630 /* 1631 * no elements => accept any params 1632 * validation will happen later 1633 */ 1634 { /* end of list */ } 1635 }, 1636 }; 1637 1638 void net_socket_rs_init(SocketReadState *rs, 1639 SocketReadStateFinalize *finalize, 1640 bool vnet_hdr) 1641 { 1642 rs->state = 0; 1643 rs->vnet_hdr = vnet_hdr; 1644 rs->index = 0; 1645 rs->packet_len = 0; 1646 rs->vnet_hdr_len = 0; 1647 memset(rs->buf, 0, sizeof(rs->buf)); 1648 rs->finalize = finalize; 1649 } 1650 1651 /* 1652 * Returns 1653 * 0: success 1654 * -1: error occurs 1655 */ 1656 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1657 { 1658 unsigned int l; 1659 1660 while (size > 0) { 1661 /* Reassemble a packet from the network. 1662 * 0 = getting length. 1663 * 1 = getting vnet header length. 1664 * 2 = getting data. 1665 */ 1666 switch (rs->state) { 1667 case 0: 1668 l = 4 - rs->index; 1669 if (l > size) { 1670 l = size; 1671 } 1672 memcpy(rs->buf + rs->index, buf, l); 1673 buf += l; 1674 size -= l; 1675 rs->index += l; 1676 if (rs->index == 4) { 1677 /* got length */ 1678 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1679 rs->index = 0; 1680 if (rs->vnet_hdr) { 1681 rs->state = 1; 1682 } else { 1683 rs->state = 2; 1684 rs->vnet_hdr_len = 0; 1685 } 1686 } 1687 break; 1688 case 1: 1689 l = 4 - rs->index; 1690 if (l > size) { 1691 l = size; 1692 } 1693 memcpy(rs->buf + rs->index, buf, l); 1694 buf += l; 1695 size -= l; 1696 rs->index += l; 1697 if (rs->index == 4) { 1698 /* got vnet header length */ 1699 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1700 rs->index = 0; 1701 rs->state = 2; 1702 } 1703 break; 1704 case 2: 1705 l = rs->packet_len - rs->index; 1706 if (l > size) { 1707 l = size; 1708 } 1709 if (rs->index + l <= sizeof(rs->buf)) { 1710 memcpy(rs->buf + rs->index, buf, l); 1711 } else { 1712 fprintf(stderr, "serious error: oversized packet received," 1713 "connection terminated.\n"); 1714 rs->index = rs->state = 0; 1715 return -1; 1716 } 1717 1718 rs->index += l; 1719 buf += l; 1720 size -= l; 1721 if (rs->index >= rs->packet_len) { 1722 rs->index = 0; 1723 rs->state = 0; 1724 assert(rs->finalize); 1725 rs->finalize(rs); 1726 } 1727 break; 1728 } 1729 } 1730 1731 assert(size == 0); 1732 return 0; 1733 } 1734